Abstract: A new intelligent amperometric type of electrochemical hydrogen probe to measure hydrogen atom permeation rate in the metals was devised and developed. Combined with MCS51 single slice computer system, specially programmed software was designed for data sampling, logging, storing, processing, result judgment and data output controlling. The probe is portable and can be used in both lab and in site automatically.

Key words: electrochemical hydrogen probe, hydmpen permeation current, steel sheet, UNS G11180 steel, H2S corrosion